Cross bolt deadlock

ABSTRACT

A cross bolt deadlock housing adapted to be mounted on the inside of the door hinged in a door frame and having a cross bolt for reception in the aperture of the cooperating strike lug on the door frame, when the door is closed. The cross bolt is operable only by means of a key from inside or outside of the door. Means is provided to prevent removal of the lock from the door unless a key is used together with other tools.

United States Patent 1191 Colombo Sept. 25, 1973 [54] CROSS BOLT DEADLOCK 2,696,728 12/1954 Jewett et al 70/448 l 44 1917 M [75] Inventor: Gregory R. Colombo, Stillwater, p64 10/ amce 70/326 Minn. [73] Assignee: Ideal Security Hardware j j g gz fi Corporation, St. Paul, Minn. O n et [22] Filed: Oct. 14, 1971' [2|] Appl. No.: 189,169 [57] ABSTRACT A cross bolt deadlock housing adapted to be mounted [52] 11.8. C1 70/104, 70/451, 70/D1G. 57, on the insid of the door hinged in a door frame and 70/DIC" 60 having a cross bolt for reception in the aperture of the [51] IITL CL. E051) 9/06 cooperaing strike lug on the door frame, when the [58] Fleld of Search 70/104, 134, 417, door is closed The cross l i operable y y means 70/451 57 of a key from inside or outside of the door. Means is provided to prevent removal of the lock from the door [56] References C'ted unless a key is used together with other tools.

UNITED STATES PATENTS I 1,404,556 1/1922 Sprung 70/104 6 Claims, 7 Drawing Figures PATENTED SEP2 5 I973 SHEET 1 OF 3 I NVENTOR.

GREG ORVR. C OL OM50 A 7' TORA y PATENTEDSEP25I975 SHEEI 2 BF 3 a 805 MW L N Mo an R M n wv% EB R G PATENTED E Z 3.760.619

sum 3 or 3 INVENTOR.

7- GPEGORS/ R. COLOMBO xcwmvr s 62010 A 7 TORNE vs CROSS BOLT DEADLOCK BACKGROUND OF THE INVENTION Cross bolt deadlocks are known, these being highly effective against being opened by unauthorized persons using a well known jimmy in an endeavor to force the lock. In many offices and apartment buildings, however, small glass windows are set in the doors or in walls adjacent the doors, these usually being too small for a person to pass through. Hence, it is a relatively easy matter for a person desiring to unlawfully enter given premises, to break the window, reach in, and turn the knob to open the deadlock, after which entry is easily effected. Should the deadlock be key operated from the inside, the intruder uses an ordinary screw driver to remove the deadlock from the door through the broken window.

SUMMARY OF THE INVENTION An important object of this invention is the provision of a cross bolt deadlock having a cross bolt which can be operated only by means of a key from either side of the door on which the lock is mounted.

Another important object is the provision of a cross bolt deadlock which requires the use of a key for removal of the lock from a door without extreme damage to lock, door or door frame, with which the lock is associated.

In the accomplishment of the above and other objects, hereinafter to become apparent, a cross bolt deadlock is provided'including a housing adapted to be mounted on the inner surface of a hinged door adjacent a free edge of the door, a cross bolt mounted in the housing for movements between lock and unlocked positions in directions parallel to the free edge of the door, a strike mounted on the door frame for reception of the cross bolt when the door is closed, and cross bolt operating members including a pair of independent key operated lock plugs one in the housing and the other adapted to bemounted in the door for operation from mounting holes therein for reception of mounting screws to hold the housing on the door, and a shield is provided to cover the mounting screws. A mounting and holding arrangement for the shield includes a moveable abutment for holding the shield against removal from the housing, access being had to the moveable abutment only when the lock plug in the housing is moved by the key therefor. Hence, an intruder cannot gain entry through the door, even when the deadlock is within reach, without the use of a key, unless the lock on the door is broken.

DESCRIPTION OF THE DRAWINGS FIG. 1 is a fragmentary view in side elevation of a door and door frame with the cross bolt deadlock of this invention mounted thereon;

FIG. 2 is an enlarged fragmentary section taken on the irregular line 22 of FIG. 1;

FIG. 3 is a view taken substantially on the irregular line 33 of FIG. 2, some parts being broken away;

FIG. 4 is a fragmentary view partly in elevation and partly in section taken on the irregular line 4-4 of FIG. 2;

FIG. 5 is a view corresponding to a portion of FIG. 4 but showing a different position of some of the parts;

FIG. 6 is anenlarged fragmentary section taken substantially on the irregular line 66 of FIG. I; and

FIG. 7 is a view similar to FIG. 3 but showing a different position of some of the parts, a portion of FIG. 7 being taken on the irregular line 7-7 of FIG. 2.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT In the drawings, a conventional hinged door is shown fragmentarily and indicated by the reference character 1, the lock of this invention being mounted on the free edge portion 2 of the door 1 opposite the hinged edge of the door, not shown, the door being mounted in a conventional door frame 3. As is customary, the door frame is provided with a stop strip 4 that is engaged by the free edge portion 2 of the door 1 when the door is closed.

The deadlock of this invention includes a housing indicated generally at 5, and including an outer or front wall portion 6 and a peripheral flange forming top and bottom side walls 7 and 8 respectively, and opposite the outside of the door. The housing is provided with end walls 9 and 10, the former of which is formed to provide a longitudinally outwardly projectingnose portion ll that is cut away to provide a pair of vertically spaced slot-like openings 12 therein opening to the interior of the housing 5. With reference particularly to FIGS. 1 and 2, it will be seen that the nose portion 11 projects laterally outwardly from the edge portion 2 of the door'l and over a portion of the door frame 3, when the door I is closed. A strike 13 includes a pair of vertically spaced lugs 14 each of which is received in a different one of the openings 12 when the door is closed. The lugs 14 have axially aligned openings 15 extending vertically therethrough. The lugs 14 are integrally formed with a mounting flange or base portion 16 that is rigidly secured to the door frame 3 by a plurality of mounting screws 17.

A cross bolt'18 is mounted in the housing 5 for reciprocatory movements in a generally vertical direction, and comprises a main body portion 19; a pair of vertically spaced arms 20 projecting laterally outwardly from the body portion 19 within the nose portion 11 of the housing 5, and a pair of axially aligned bolt portions 21 disposed to move transversely into and out of respective ones of the slot-like openings 15 responsive to movements of the main body portion 19 within the housing 5. The strike lugs 14, being positioned to be received in the slot-like openings 12 when the door is closed, the openings 15 therein become aligned with the bolt portion 21, so that, when the cross bolt 18 is moved in one direction, the bolt portions 21 thereof are received in respective ones of the strike lug openings 15. The body portion 19 is formed to provide an elongated lug or rail 22 that is longitudinally slidably received in elongated guide channel or groove 23 in the housing wall 6, whereby the cross bolt 18 is guided for sliding movements within the housing 5 between locked and unlocked positions relative to the strike 13. In the released position of the cross bolt 18, shown in FIG. 3, the bolt portions 21 are substantially out of their respective slot-like openings 12 in the nose portion 11. In the fully locked position of the cross bolt 18, the bolt portions 21 extend through the strike lug openings 15 and completely span the slot-like openings 12 in the nose portion 11. In FIG. 7, the cross bolt 18 is shown as being in a partially locked condition. The cross bolt 18 is held or confined against lateral movement outwardly of engagement of the rail 22 with the channel 23 by a removeable plate-like inner wall member 24 having one end portion received beneath a pair of confining lugs 25 projecting laterally inwardly from the housing end wall 9, the opposite end portion of the wall member 24 engaging a supporting lug 26 formed in the end wall 10 and a like supporting lug 27 formed in the bottom wall 8. An elongated boss 28 extends laterally inwardly from the housing wall 6 adjacent the housing wall 7 to support the inner wall member 24 adjacent the wall 7. The boss 28 is provided with a screw threaded axial opening for reception of an anchoring screw 29 that extends through a suitable opening in the inner wall member 24, to releasably lock the inner wall member 24 within the housing 5.

The outer or front wall 6 of the housing is formed to provide an elongated hub 30 defining an axial opening 31 therethrough, the axis of the opening 31 being normal to the inner surface 32 of the door 1 when the housing 5 is mounted thereon. The hub 30 has an axially shorter portion 33 projecting inwardly from the housing wall 6 and a relatively longer lock cylinder outer portion 34 projecting outwardly from the housing wall 6. The inner hub portion 33 is formed to provide a lug or boss 35 that projects radially toward the cross bolt 18 and which is formed to provide a pair of laterally spaced flat shoulders 36 that are spaced apart in the direction of movement of the cross bolt 18 and normal to said direction of movement. The cross bolt 18 is formed to provide a pair of transverse guide flanges 37 which define opposite sides ofa channel 38 in which is slidably mounted a plunger 39. The plunger 39 is provided at its outer end with a head 40 having opposite flat sides that are adapted to selectively engage opposite ones of the shoulders 36, at opposite limits of movement of the cross bolt 18, to releasably lock the cross bolt 18 against movement in given directions of locking and releasing movement thereof. A coil compression spring 41 disposed in the channel 38 yieldingly urges the plunger 39 toward engagement of the head 40 thereof with the lug or boss 35. A retainer plate 42 is peened or otherwise rigidly secured to the guide flanges 37 to hold the plunger 39 in the channel 38, and the inner end of the plunger 39 is provided with a laterally outwardly projecting abutment portion 43 that is adapted to engage the retainer plate 42 to limit longitudinally outward movement of the plunger 39 with respect to the channel 38. With reference to FIG. 3 it will be seen that the plunger head 40 is disposed in engagement with one of the shoulders 36 to hold the latch bolt 18 in its released position; and in FIG. 7, the latch bolt 18 is shown as being disposed in a partially advanced position toward its locking position, the plunger head 40 being disposed intermediate the shoulders 36.

The plunger 39 is adapted to be retracted out of engagement of the plunger head 40 with either shoulder 36, and together with the cross bolt 18, moved toward the opposite shoulder 36 by a selected one of a pair of cams 44 and 45. The cam 44 is disposed just inwardly of the inner hub portion 33 and is rigidly secured, by means of a pair of machine screws or the like 46, to the inner end of a cylinder lock plug 47 mounted for rotation in the axial opening 31. As shown in FIGS. 1, 4 and 5, the lock plug 47 is provided with the usual notched opening 48 for reception of a key, not shown, but by means of which the lock plug 47 and cam 44 thereon may be rotated. The arrangement is such that the cam 44 may be rotated in opposite directions from a neutral position shown in FIG. 2, it being necessary that the lock plug 47 is in its neutral position of the cam 44 when the key, not shown, is inserted or removed from the key slot 48 thereof. The cam 44 is provided with circumferentially spaced cam surface portions 49 that engage the plunger head 40 to retract the same out of engagement with its adjacent shoulder 36 against bias of the spring 41, and thereafter move the plunger 39 with the cross bolt 18 from one of its locked or released positions to the other thereof. When the cross bolt 18 is thus moved, the cam 44 may be rotated back to its neutral position of FIG. 3 and the key withdrawn from the lock plug 47.

The cam 45 is provided with circumferentially spaced plunger head engaging cam surfaces 50 substantially identical to the cam surfaces 49 on the cam 44, the cam 45 being mounted on a hub 51 for common rotation therewith, by means of diametrically opposed key ways 52 in the cam 45 and cooperating keys 53 in the hub 51, see particularly FIG. 7. The hub 51 is journalled in an opening in the inner wall member 24 for rotation on an axis aligned with the axis of the lock plug 47, and is provided with a cross shaped axial opening 54 for axial sliding reception of a conventional crosssectionally rectangular lock spindle 55. The spindle 55 is mounted in a commercially available key operated lock plug, not shown, but contained within a lock plug cylinder 56 that is mounted in a supporting member, commonly known as a cylinder rose, and indicated at 57. The cylinder rose 57 is mounted in a transverse opening 58 through the door 1, the lock plug cylinder 56 being held in the cylinder rose 57 and in the opening 58 by a pair of laterally spaced mounting screws 59 extending through openings in a retainer plate 60 that engages the inner surface 32 of the door 1, the screws 59 being screw threaded into inner end of the lock plug cylinder 56, see particularly FIGS. 2 and 6. The lock plug of the cylinder 56 is, like the lock plug 47, of the type which is rotatable in opposite directions from a neutral position of its cam 45, at which position the key therefore may be inserted or withdrawn.

The outer hub portion 34 and the outer or front wall 6 of the housing 5 cooperate to define an annular outwardly opening recess 61 within which the wall 6 is formed to provide a plurality of counter-sunk openings 62 through which extend housing mounting screws 63,

at least a pair of which are screw threaded into the door 1 radially outwardly of the opening 58 therethrough, another pair of the screws 63 being screw threaded into the adjacent inner end of the cylinder rose 57. This arrangement is specifically disclosed in the co-pending Henry Kartarik application for U. S. Letter Patent, Ser. No. l79,443 filed Sept. 10, 1971, and entitled DOOR LOCK CYLINDER ROSE. The heads of the lock mounting screws 63 are covered by a cup-shaped shield 64 having a marginal edge 65 disposed within the recess 61 adjacent the marginal portion thereof. The shield 64 has a generally flat outer end 66 defining a central opening 67 therethrough coaxial with the lock plug 47, the outer end 66 further defining a notch 68 opening radially inwardly to the central opening 67, the notch 68 cooperating with the adjacent end of the lock plug 47 to define a passageway to the interior of the shield 64. As shown particularly in FIGS. 4 and 5, the notch is normally closed by a lug 69 formed integrally with the adjacent outer end of the lock plug 47 and projecting radially outwardly therefrom, the lug 69 being moved out of registration with the notch or passageway 68 when the lock plug 47 is rotated to move its respective cam 44 away from its neutral position.

The shield 64 is held in engagement with the housing 5 by means of a bayonet type joint comprising a pair of diametrically opposed hook shaped lugs 70 that extend generally axially inwardly from the marginal edge portion 65 of the shield 64, and diametrically opposed generally L-shaped openings 71 in the housing wall 6 within the recess 61 thereof. The openings 71 have radially wide and narrow portions 72 and 73 respectively. When the shield 64 is applied to the housing 5, the hook-shaped lugs 70 are inserted inwardly through the wide portions 72 of their respective openings 71, after which the shield 64 is rotated to bring the lugs 70 into the narrow portion 73 to lock the shield 64 in place. The lugs 70, openings 71, and notch 68 are so disposed relative to the lock plug 47, that when the shield 64 is thus locked in place, the notch 68 overlies the lock plug lug 69 when the lock plug 47 is in its neutral position.

The shield 64 is formed to provide an interior leg 74 that projects axially inwardly from the outer wall 66 therein, the inner end of the leg 74 being formed to provide a detent element 75 defining an axially projecting shoulder 76. Within the recess 61, the housing wall 6 is formed with a pocket 77 in which is peened or th.- erwise rigidly mounted a moveable abutment in the nature of a leaf spring 78, see particularly FIGS. 4-6. The spring 78 is axially inwardly disposed relative to the notch 68 of the shield 64, and has its free end 79 disposed in abutting engagement with the abutment 76 when the shield 64 is rotated to its locked position in the recess 61, to positively lock the shield 64 against rotation in a direction to release the bayonet forming lug 70 from the smaller opening portion 73.

When the above-described lock is initially mounted on the door, the shield 64 is placed on the housing only after the housing 5 and other partscarried thereby have been mounted on the inner surface 32 of the door. After the lock has been installed, should there be any reason for removing the lock or for changing the lock plugs, a key must be used to rotate the lock plug 47 so that the lug 69 may be moved out of registration with the notch 68. With this done, a length of stiff metal wire or rod, or other device, such as an ice pick, may be inserted axially inwardly through the notch or passageway 68 to depress the movable abutment spring 78 out of engagement of its end 79 with the shoulder 76. This permits the shield 64 to be rotated sufficiently disengage the bayonet joint arrangement, whereupon the shield 64 may be removed. With the shield 64 removed, access is had to the heads of the screws 63 for removal of the lock from the door.

From the above, it will be seen that, in order to remove the lock from the door without breaking the same, any person, whether authorized or not, must have a key which fits the lock plug 47 in order to gain access to the mounting screws 63. Unless an intruder has a key which will open the lock, breaking ofa small window either in the door 1 or in the wall adjacent to the door frame 3 will be of no avail in removing the lock from the inside of the door through such a broken window.

While I have shown and described a commercial embodiment of my improved cross bolt deadlock, it will be understood that the same is capable of modification without departure from the spirit and scope of the invention, as defined in the claims.

What is claimed is:

1. A cross bolt deadlock comprising:

a. a housing element adapted to be mounted on one side of a door hinged in a door frame, adjacent a free edge of the door, said housing element having a slot-like opening to the inside thereof and facing an adjacent portion of the door frame;

b. a lock plug receiving cylinder on said housing element, said cylinder having an axis extending trans.- versely of the door when the housing element is mounted thereon, said housing element having a plurality of mounting apertures through a portion thereof for reception of mounting elements securing said housing element to said door;

0. a key operated lock plug rotatably mounted in said cylinder and having an inner end disposed within said housing element;

d. a strike adapted to be mounted on the door frame and having a lug for reception in said opening when the door is closed, and a aperture in said lug;

e. a cross bolt element mounted in said housing for limited movement in opposite directions parallel to said free edge of the door toward and away from reception in the aperture in said lug;

f. means connected to said lock plug within said housing element for imparting movement to said cross bolt element toward and away from locking engagement with said lug responsive to rotation of said lock plug in opposite directions;

g. a shield overlying said mounting apertures, said shield and housing element having cooperating bayonet joint portions whereby said shield may be moved in opposite directions to lock the same to the housing element and to release the shield therefrom;

h. a fixed shoulder and cooperating movable abutment one on said housing element and the other on said shield, said moveable abutment being yieldingly urged into abutting relation with said shoulder to lock said shield against movement in a direction to release said shield, said shield having a passageway providing access to said abutment whereby the same may be moved to unlock the shield;

i. and means moveable with said lock plug normally closing said passageway and opening the same only when the lock plug is rotated in a given direction by a key.

2. The cross bolt deadlock defined in claim 1 in which said mounting apertures are disposed radially outwardly of said cylinder and in circumferentially spaced relationship, said shield being cup shaped and encompassing said cylinder, said shield having an axial opening defining said passageway and providing access for a key to said lock plug.

3. The cross bolt deadlock defined in claim 2 in which said bayonet joint portions include hook elements projecting in a direction generally axially from circumferentially spaced portions of said cup shaped shield, and cooperating circumferentially spaced hook receiving openings in said housing element.

4. The cross bolt deadlock defined in claim 3 in which said housing element and said lock plug receiving cylinder are integral and cooperate to define an axially outwardly opening annular recess, said hook reabutment.

6. The cross bolt deadlock defined in claim 5 in which said lock plug includes a radially outwardly projecting lug, said cylinder defining a circumferentially extending recess at its outer end for reception of said lug to limit rotary movement of said lock plug, said lug providing said means normally closing said passageway in said shield. 

1. A cross bolt deadlock comprising: a. a housing element adapted to be mounted on one side of a door hinged in a door frame, adjacent a free edge of the door, said housing element having a slot-like opening to the inside thereof and facing an adjacent portion of the door frame; b. a lock plug receiving cylinder on said housing element, said cylinder having an axis extending transversely of the door when the housing element is mounted thereon, said housing element having a plurality of mounting apertures through a portion thereof for reception of mounting elements securing said housing element to said door; c. a key operated lock plug rotatably mounted in said cylinder and having an inner end disposed within said housing element; d. a strike adapted to be mounted on the door frame and having a lug for reception in said opening when the door is closed, and a aperture in said lug; e. a cross bolt element mounted in said housing for limited movement in opposite directions parallel to said free edge of the door toward and away from reception in the aperture in said lug; f. means connected to said lock plug within said housing element for imparting movement to said cross bolt element toward and away from locking engagement with said lug responsive to rotation of said lock plug in opposite directions; g. a shield overlying said mounting apertures, said shield and housing element having cooperating bayonet joint portions whereby said shield may be moved in opposite directions to lock the same to the housing element and to release the shield therefrom; h. a fixed shoulder and cooperating movable abutment one on said housing eleMent and the other on said shield, said moveable abutment being yieldingly urged into abutting relation with said shoulder to lock said shield against movement in a direction to release said shield, said shield having a passageway providing access to said abutment whereby the same may be moved to unlock the shield; i. and means moveable with said lock plug normally closing said passageway and opening the same only when the lock plug is rotated in a given direction by a key.
 2. The cross bolt deadlock defined in claim 1 in which said mounting apertures are disposed radially outwardly of said cylinder and in circumferentially spaced relationship, said shield being cup shaped and encompassing said cylinder, said shield having an axial opening defining said passageway and providing access for a key to said lock plug.
 3. The cross bolt deadlock defined in claim 2 in which said bayonet joint portions include hook elements projecting in a direction generally axially from circumferentially spaced portions of said cup shaped shield, and cooperating circumferentially spaced hook receiving openings in said housing element.
 4. The cross bolt deadlock defined in claim 3 in which said housing element and said lock plug receiving cylinder are integral and cooperate to define an axially outwardly opening annular recess, said hook receiving openings being disposed within said recess, said shield having a marginal edge, said hook elements projecting from said marginal edge, said marginal edge being contained within said recess when said hook elements are disposed in said hook receiving openings.
 5. The cross bolt deadlock defined in claim 2 in which said shoulder is fixed on said shield for common movement therewith, said moveable abutment comprising a leaf spring mounted on said housing element and having a free end portion providing said moveable abutment.
 6. The cross bolt deadlock defined in claim 5 in which said lock plug includes a radially outwardly projecting lug, said cylinder defining a circumferentially extending recess at its outer end for reception of said lug to limit rotary movement of said lock plug, said lug providing said means normally closing said passageway in said shield. 